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Juergen Gross
40da8a7e4b
Add the basic access macros for unaligned data to common-macros.h. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com>
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#ifndef __XEN_TOOLS_COMMON_MACROS__
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#define __XEN_TOOLS_COMMON_MACROS__
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/*
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* Caution:
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*
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* This header must be completely self-contained. There are no external
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* references to variables or functions allowed, as the file might be included
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* for different runtime environments, such as firmware or target and build
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* host programs.
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*/
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#ifndef BUILD_BUG_ON
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
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#define BUILD_BUG_ON(p) ({ _Static_assert(!(p), "!(" #p ")"); })
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#else
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#define BUILD_BUG_ON(p) ((void)sizeof(char[1 - 2 * !!(p)]))
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#endif
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#endif
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*a))
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#endif
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#ifndef MAX
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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#endif
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#ifndef MIN
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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#endif
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#ifndef min
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#define min(x, y) \
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({ \
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const typeof(x) _x = (x); \
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const typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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(_x < _y) ? _x : _y; \
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})
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#endif
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#ifndef max
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#define max(x, y) \
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({ \
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const typeof(x) _x = (x); \
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const typeof(y) _y = (y); \
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(void)(&_x == &_y); \
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(_x > _y) ? _x : _y; \
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})
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#endif
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#ifndef min_t
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#define min_t(type, x, y) \
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({ \
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const type _x = (x); \
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const type _y = (y); \
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(_x < _y) ? _x: _y; \
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})
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#endif
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#ifndef max_t
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#define max_t(type, x, y) \
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({ \
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const type _x = (x); \
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const type _y = (y); \
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(_x > _y) ? _x: _y; \
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})
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#endif
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#ifndef ROUNDUP
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#define ROUNDUP(_x,_w) (((unsigned long)(_x)+(1UL<<(_w))-1) & ~((1UL<<(_w))-1))
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#endif
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#define MASK_EXTR(v, m) (((v) & (m)) / ((m) & -(m)))
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#define MASK_INSR(v, m) (((v) * ((m) & -(m))) & (m))
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#ifndef __must_check
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#define __must_check __attribute__((__warn_unused_result__))
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#endif
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#ifndef __packed
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#define __packed __attribute__((__packed__))
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#endif
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#define container_of(ptr, type, member) ({ \
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typeof(((type *)0)->member) *mptr__ = (ptr); \
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(type *)((char *)mptr__ - offsetof(type, member)); \
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})
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#define __AC(X, Y) (X ## Y)
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#define _AC(X, Y) __AC(X, Y)
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#define get_unaligned_t(type, ptr) ({ \
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const struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr); \
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ptr_->x; \
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})
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#define put_unaligned_t(type, val, ptr) do { \
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struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr); \
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ptr_->x = val; \
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} while (0)
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#define get_unaligned(ptr) get_unaligned_t(typeof(*(ptr)), ptr)
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#define put_unaligned(val, ptr) put_unaligned_t(typeof(*(ptr)), val, ptr)
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#endif /* __XEN_TOOLS_COMMON_MACROS__ */
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